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#1 |
diyAudio Member
Join Date: Nov 2003
Location: Oxford
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Hi all,
Has anyone had any experience with the Vacuum State Electronics FVP5A phono stage? The input impedance of my pre-amp is 50k so I though the riaa stage would be pretty compatible (leave out the line stage). My initial idea was to use a smooth non regulated B+ supply as the current draw would be pretty low. Is this "SuperReg" a specific design or just a 250v regulated supply? Cheers Hesky
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Hesky |
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#2 | ||
diyAudio Senior Member
Join Date: Aug 2002
Location: Belgium
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Hi,
Quote:
Quote:
Cheers, ![]()
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Frank |
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#3 | |
diyAudio Member
Join Date: Nov 2003
Location: Oxford
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Hi frank,
Quote:
I think I should "take my stabilizes off" so to speak and design my own regulated b+ supply for this phono stage. I'd like to design my own phono stage, but I'm not confident (smart is a more appropriate word) enough to tackle the calculations required to select values for an riaa circuit, not yet anyway. Thanks Hesky
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Hesky |
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#4 |
RIP
Join Date: Dec 2002
Location: C'ville VA, USA
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This circuit is a cascode input in which the fet replaces the traditional bottom triode. If you want to stay "all tube", you might look at this Steve Bench design. I haven't heard Mr. Wright's design, but Mr. Bench's definately rocked my boat.
It also needs a regulated(quiet) psu. You can't go wrong either way. |
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#5 |
diyAudio Member
Join Date: Nov 2003
Location: Oxford
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Hi Pedro,
Thanks for the link to Steve's phono design, I navigated my way around to his site and its a real interesting read!! He's attempted five phono designs and really rates the one you linked. I'm very tempted. It sounds like you have already built one of his phono designs. Thanks
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Hesky |
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#6 | |
RIP
Join Date: Dec 2002
Location: C'ville VA, USA
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Quote:
As far as Mr. Wright's stage, I think Brett, who posts on this forum, has built it - and really likes it. |
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#7 |
diyAudio Member
Join Date: Nov 2003
Location: Oxford
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Hi Pedro,
What sort of B+ supply did you use? regulated or a real smooth non regulated suppy. He says the circuit can run from anything from 170 volts to 250 volts. 250 volts gives a bit more gain and a little less distortion. The downside is it consumes more current, which isnt much of a problem. Cheers
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Hesky |
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#8 | |
RIP
Join Date: Dec 2002
Location: C'ville VA, USA
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Quote:
here's the schematic: ![]() |
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#9 |
diyAudio Member
Join Date: Feb 2003
Location: Noord-Holland
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Hesky,
I 've build the FVP5A and it's definite the best and most quiet MCphono stage I ever build. The superreg is a special powersupply that I really recommend. It makes the FVP really sing. Dick.
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“Information is not knowledge Knowledge is not wisdom Wisdom is not truth Truth is not beauty Beauty is not love Love is not music Music is THE BEST” |
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#10 | |
diyAudio Member
Join Date: Nov 2003
Location: Oxford
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Quote:
Pedro, your B+ supply looks pretty sweet, cant help but think how hard it would be to get hold of those OC3 voltage regulator tubes! Just a few questions, is it beneficial to also us an isolation transformer? and how exactly does the 10m45s current regulator and the OC3 voltage regulator work together, what are they doing moreover? Cheers
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Hesky |
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